Create and send private transactions
Create and send private transactions using:
- web3js-quorum client library or web3j client library
eea_sendTransaction
with EthSignereea_sendRawTransaction
priv_distributeRawTransaction
.
All private transaction participants must be online for a private transaction to be successfully distributed. If any participants are offline when submitting the private transaction, the transaction is not attempted and you must resubmit the transaction.
The gas
and gasPrice
specified when sending a private transaction are used by the privacy marker transaction (PMT), not the private transaction itself.
Private transactions either deploy contracts or call contract functions. Ether transfer transactions cannot be private.
eea_sendRawTransaction
eea_sendRawTransaction
distributes the private transaction to the participating nodes, and signs and submits the PMT, as described in Private transaction processing.
If sending concurrent transactions, you must use priv_distributeRawTransaction
instead of eea_sendRawTransaction
.
priv_distributeRawTransaction
Use priv_distributeRawTransaction
instead of eea_sendRawTransaction
when sending concurrent private transactions.
priv_distributeRawTransaction
distributes the private transaction to the participating nodes but does not sign and submit the PMT. That is, it performs steps 1 to 5 of private transaction processing.
If using priv_distributeRawTransaction
instead of eea_sendRawTransaction
, use the value returned by priv_distributeRawTransaction
, which is the enclave key to the private transaction in Tessera, in the data
field of a call to eth_sendRawTransaction
. Use the value returned by priv_getPrivacyPrecompileAddress
, which is the address of the privacy precompiled contract, in the to
field of the call.
By using the public Ethereum transaction, eth_sendRawTransaction
, you are signing and submitting the PMT yourself instead of having it signed by the Besu node, giving you greater control over the PMT.
If the PMT is not sent after distributing the private transaction, the distributed private transaction is not executed and the private states are not updated.
{
"jsonrpc": "2.0",
"method": "priv_distributeRawTransaction",
"params": [
"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"
],
"id": 1
}
{
"jsonrpc": "2.0",
"id": 1,
"result": "0xfd0d90ab824574abc19c0776ca0210e764561d0ef6d621f2bbbea316eccfe56b"
}
Send the enclave key in the data
field, and the privacy precompile address in the to
field of eth_sendRawTransaction
:
{
"jsonrpc": "2.0",
"method": "eth_sendRawTransaction",
"params": [
{
"from": "0xfe3b557e8fb62b89f4916b721be55ceb828dbd73",
"to": "0x000000000000000000000000000000000000007e",
"data": "0xfd0d90ab824574abc19c0776ca0210e764561d0ef6d621f2bbbea316eccfe56b",
"gas": "0x2E1800",
"gasPrice": "0x9184e72a000"
}
],
"id": 1
}
EEA-compliant or Besu-extended privacy
To create an EEA-compliant private transaction, specify privateFor
when creating the signed transaction passed as an input parameter to eea_sendRawTransaction
.
To create a Besu-extended private transaction, specify a privacyGroupId
when creating the signed transaction passed as an input parameter to eea_sendRawTransaction
.
Unsigned and unencoded private transactions
The eea_sendRawTransaction
parameter is a signed RLP-encoded private transaction. Shown below are examples of unsigned and unencoded private transactions to create a contract.
{
"to": null,
"from": "0xfe3b557e8fb62b89f4916b721be55ceb828dbd73",
"gas": "0x7600",
"gasPrice": "0x0",
"data": "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",
"nonce": "0x0",
"privateFrom": "negmDcN2P4ODpqn/6WkJ02zT/0w0bjhGpkZ8UP6vARk=",
"privateFor": [
"g59BmTeJIn7HIcnq8VQWgyh/pDbvbt2eyP0Ii60aDDw=",
"6fg8q5rWMBoAT2oIiU3tYJbk4b7oAr7dxaaVY7TeM3U="
],
"restriction": "restricted"
}
{
"to": null,
"from": "0xfe3b557e8fb62b89f4916b721be55ceb828dbd73",
"gas": "0x7600",
"gasPrice": "0x0",
"data": "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",
"nonce": "0x0",
"privateFrom": "negmDcN2P4ODpqn/6WkJ02zT/0w0bjhGpkZ8UP6vARk=",
"privacyGroupId": "kAbelwaVW7okoEn1+okO+AbA4Hhz/7DaCOWVQz9nx5M=",
"restriction": "restricted"
}
The example
directory in the web3js-quorum client library contains examples of signing and encoding private transactions.